Deuteronomy 21:15-19

“If a man has two wives, the one loved and the other unloved, and both the loved and the unloved have borne him sons, and the firstborn son belongs to the unloved,

then it shall be on the day that he wills what he owns as an inheritance to his sons, he is not allowed to treat the son of the loved wife as the firstborn, at the expense of the son of the unloved, who actually is the firstborn son.

On the contrary, he shall acknowledge the firstborn, the son of the unloved wife, by giving him a double portion of everything that he owns, for he was the beginning of his strength; to him belongs the right of the firstborn.

“If any person has a stubborn and rebellious son who does not obey his father or his mother, and when they discipline him, he does not listen to them,

then his father and mother shall seize him, and bring him out to the elders of his city at the gateway of his hometown.